ECC单轴受拉损伤本构模型研究  

RESEARCH ON DAMAGE CONSTITUTIVE MODEL OF ENGINEERED CEMENTITIOUS COMPOSITES UNDER UNIAXIAL TENSION

作　　者：李可[1] 赵大鹏 刘伟康 范家俊[1] LI Ke;ZHAO Da-peng;LIU Wei-kang;FAN Jia-jun(School of Civil Engineering,Zhengzhou University,Zhengzhou,He’nan 450001,China;School of Civil Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150006,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150006

出　　处：《工程力学》2022年第12期120-129,共10页Engineering Mechanics

基　　金：国家自然科学基金青年项目(51708511,51608489);国家自然科学基金面上项目(51879243);国家自然科学基金委河南联合基金项目(U1804137);中国博士后科学基金项目(2021TQ0302)。

摘　　要：通过单轴拉伸试验,讨论了PVA纤维体积掺入量和水胶比对工程用水泥基复合材料(ECC)受拉力学性能参数(开裂应变、开裂应力、峰值应变、峰值应力、极限应变以及应力-应变关系曲线)的影响规律。基于此,从损伤力学的角度讨论了ECC在单轴受拉过程的开裂前阶段、应变硬化阶段以及应变软化阶段的损伤演化机制。进而,基于ECC受拉损伤演化机制提出ECC受拉损伤本构模型,并给出模型相关参数的计算方法,分析表明:该文提出损伤模型得到的ECC受拉损伤演化曲线能更为合理的描述ECC的损伤演化全过程。最后,该文损伤模型计算的ECC受拉应力-应变关系曲线和试验曲线对比结果表明,所提出的模型能够合理的描述ECC受拉非线性应力-应变关系特征,且具有良好的精度。The effects of polyvinyl alcohol(PVA)fiber volume and water-binder ratio on tensile mechanical properties(cracking strain,cracking stress,peak strain,peak stress,ultimate strain and stress-strain relationship)of Engineered Cementitious Composites(ECC)were investigated through uniaxial tensile test.Based on test results,the damage evolution mechanism of ECC during the pre-cracking stage,strain hardening stage and strain softening stage of uniaxial tension process was discussed from the perspective of damage mechanics.Furthermore,based on the ECC tensile damage evolution mechanism,the ECC tensile damage constitutive model was proposed,and the calculation method of the model parameters was given.The analysis result shows that the ECC tensile damage evolution curve calculated by the proposed model can reflect the whole process of ECC damage more reasonably.Finally,Comparisons between the tensile stress-strain relationship curve calculated by the proposed model and the test curve demonstrate that the model can reasonably describe the nonlinear tensile stress-strain relationship of ECC and has good accuracy.

关 键 词：工程用水泥基复合材料 拉伸性能 损伤模型 应力-应变关系 非线性行为 

分 类 号：TU528.58[建筑科学—建筑技术科学]